Spin states and phase separation in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">La</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mi>−</mml:mi><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CoO</mml:mi></mml:mrow>

Loshkareva, N. N.; Ганьшина, Е. А.; Белевцев, Б. И.; Sukhorukov, Yu. P.; Mostovshchikova, E. V.; Vinogradov, A. N.; Krasovitsky, V. B.; Chukanova, I. N.

doi:10.1103/physrevb.68.024413

Cited by 23 publications

(25 citation statements)

References 40 publications

(149 reference statements)

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“…Moreover, before attaining such homogeneous state with itinerant electrons, the system has the doping range favorable for the phase separation, in which IS Co 3+ ions are located within nanoscale inhomogeneities. This picture is in an agreement with experimental data on La 1−x Sr x CoO 3 system [294,295,296,297,298,299].…”

Section: Effects Of Electron Delocalization and Spin-state Transitions: Ls-ls Ground State For Isolated Ionssupporting

confidence: 91%

Electronic phase separation: Recent progress in the old problem

2021

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Section: Effects Of Electron Delocalization and Spin-state Transitions: Ls-ls Ground State For Isolated Ionssupporting

confidence: 91%

Electronic phase separation: Recent progress in the old problem

2021

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“…2). This effect points to an additional distortion that splits the e explain by the formation of magnetopolarons using the idea of a spin-state transition [17] similar to the related compound La 1−y Sr y CoO 3 [30,31,32,33]. In Na x CoO 2 , this mechanism would be driven by a displacement of the neighboring oxygen ligands towards the central Co…”

Section: A Co L-edgementioning

confidence: 99%

X-ray absorption spectroscopy ofNaxCoO2layered cobaltates

et al. 2006

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Measurements of polarization and temperature dependent soft x-ray absorption have been performed on NaxCoO2 single crystals with x=0.4 and x=0.6. They show a deviation of the local trigonal symmetry of the CoO6 octahedra, which is temperature independent in a temperature range between 25 K and 372 K. This deviation was found to be different for Co 3+ and Co 4+ sites. With the help of a cluster calculation we are able to interpret the Co L23-edge absorption spectrum and find a doping dependent energy splitting between the t2g and the eg levels (10Dq) in NaxCoO2.PACS numbers:

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“…This phenomenon was actually observed in some cobaltites, e.g., in La 1−x Sr x CoO 3 . There are already many indications of phase separation and formation of inhomogeneous states in this system [21][22][23][24][25] but probably the most clear evidence comes from the study of very low-doped LaCoO 3 . Magnetic measurements 7 have shown that at very low doping ͑Ͻ1% of Sr͒ the moment per doped hole ͑per Sr͒ is much bigger than that of thus created LS Co 4+ with S =1/ 2: instead there appear magnetic impurities with unusually large spin S = 5 -10, which signals that each hole is "dressed" by the magnetic cloud due to the promotion of some of neighboring Co 3+ ions to a magnetic state.…”

Section: Introductionmentioning

confidence: 99%

Phase separation in doped systems with spin-state transitions

et al. 2009

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Spin-state transitions, observed in many transition metal compounds containing Co$^{3+}$ and Fe$^{2+}$, may occur with the change of temperature, pressure, but also with doping, in which case the competition of single-site effects and kinetic energy of doped carriers can favor a change in the spin state. We consider this situation in a simple model, formally resembling that used for manganites in Phys. Rev. Lett. 95, 267210 (2005). Based on such a model, we predict the possibility of a jump-like change in the number of Co$^{3+}$ ions undergoing spin-state transition caused by hole doping. A tendency to the electronic phase separation within a wide doping range is demonstrated. Phase diagrams with the regions of phase separation are constructed at different values of the characteristic parameters of the model.Comment: 9 pages, 5 figures, submitted to Phys. Rev.

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Spin states and phase separation inLa1−xSrxCoO

Cited by 23 publications

References 40 publications

Electronic phase separation: Recent progress in the old problem

Electronic phase separation: Recent progress in the old problem

X-ray absorption spectroscopy ofNaxCoO2layered cobaltates

Phase separation in doped systems with spin-state transitions

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